Constructing a “Native” Oxyfluoride Layer on Fluoride Particles for Enhanced Upconversion Luminescence

Liu, Tian; Shang, Yunfei; Hao, Shuwei; Han, Qi; Chen, Tong; Lv, Weiqiang; Yang, Chunhui

doi:10.1002/adfm.201803946

Cited by 42 publications

(19 citation statements)

References 43 publications

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“…The reason for luminescence enhancement of the core‐shell heterostructures are complex, and it could be attributed to the multiple effects including the improved crystal quality, passivated surface effect by oxide shell, and improved energy transfer efficiency through the synergistic effect of fluoride and oxide phonons. [ 16 ] Output color can be also intentionally tuned by varying the contents of Tm 3+ ions in a three‐component dopant system (NaYF 4 :Yb 3+ /Er 3+ /Tm 3+ @YOF:Yb 3+ /Er 3+ /Tm 3+ ) based on the control of relative ratio of dual emission process. [ 23 ] As shown in Commission International de l'Eclairage (CIE) chromaticity coordinates, the samples after LI exhibit a wider tuning range from green via yellow to crimson (Figure 5B).…”

Section: Resultsmentioning

confidence: 99%

Constructing lattice‐mismatched upconversion luminescence heterojunctions via light welding in seconds

Gao

Wang

et al. 2020

Nano Select

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Heterostructures are an important class of materials with desirable size, morphology, and functionality because of their promising applications in biosensor and photonic communication device. However, no such technology of synthesizing heterojunctions is as convenient as electric welding. Particularly, synthesizing heterojunctions with large lattice‐mismatch has been subjected to a great challenge. Herein, the hybrid heterojunction structures are obtained by in situ chemical transformation from fluoride to oxyfluoride via a laser irradiation‐welding approach (LIWA). Single NaYbF4:Ho3+@YbOF:Ho3+ heterojunctions with unique morphologies including hollow spheres, lollipops and sponge‐like plates, are successfully prepared by deliberate control over precursor particles and light welding parameters. These unique luminescent heterojunctions can not only integrate distinctive properties of fluoride and oxide, but also exhibit the unprecedented convenience for color tunability. This work provides an ultrafast LIWA for the fabrication of lattice‐mismatched heterojunctions in seconds, and LIWA allows tunable laser parameters to control the microstructures and characteristics of heterojunctions for widespread applications.

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Section: Resultsmentioning

confidence: 99%

Constructing lattice‐mismatched upconversion luminescence heterojunctions via light welding in seconds

Gao

Wang

et al. 2020

Nano Select

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“…Liang et al 6 designed a highly efficient β-NaYF 4 :Er 3+ ,Yb 3+ @SiO 2 @TiO 2 UC material as a scattering layer and achieved a PCE of 9.21%. Tian et al 7 also reported that incorporation of the core−shell NaY-F 4 :Yb 3+ ,Er 3+ @YOF:Yb 3+ ,Er 3+ UC phosphor resulted an improved DSSC efficiency from 7.02 to 8.39%. Also, the DC phosphor in photovoltaic application is reported to provide an excellent photo-physical and light harvesting feature.…”

Section: ■ Introductionmentioning

confidence: 98%

Enhanced Power Conversion Efficiency Using a Ce³⁺:SrF₂ Down-Shifting Nanophosphor-Based Photoelectrode for Dye-Sensitized Solar Cell Applications

Samuel

Jayaraman³

et al. 2021

ACS Appl. Energy Mater.

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A lanthanide-doped inorganic down-shifting nanophosphor that converts the intense ultra-violet (UV) light photons to visible-light photons is highly attractive for dye-sensitized solar cells (DSSCs) to enhance light harvesting and power conversion efficiencies. In the present research, for the first time, a highly luminescent Ce3+-doped SrF2 (Ce3+:SrF2) nanophosphor is employed as a down-shifting nanophosphor material in the photoanode of DSSC. The nanophosphor was synthesized by co-precipitation technique, followed by a rapid microwave calcination approach. The structural and morphological properties of the synthesized nanophosphor are investigated by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy analyses. The optical absorption and emission characteristics of the Ce3+:SrF2 down-shifting nanophosphor are investigated. Interestingly, the nanophosphor displayed a broad luminescence in the visible region under UV wavelength excitation. Absorption studies show that the Ce3+:SrF2 nanophosphor absorbs the deep-UV and near-UV radiations, protecting the iodide electrolyte from thermal degradation. To further study the performance of the down-shifting layer in DSSC, the Ce3+:SrF2/TiO2 nanocomposite-based photoanodes were used to fabricate the DSSCs. As a result, the nanocomposite-based device has demonstrated an excellent photo-conversion efficiency of 8.8%. The improvement in the incident-photon-to-current efficiency curve and electrochemical values (J sc = 15.2 mA cm–2, V oc = 0.82 V, and FF = 0.73) are due to the enhanced visible-light photon harvesting and high chemical stability.

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“…Lanthanide ion doped upconversion nanomaterials (LUNMs) have received tremendous attention in recent years owning to their unique photophysical characteristics and wide application spanning from solid state lasers, photovoltaic conversion, − 3D display, bioimaging, − photoinduced therapy, to temperature sensor techniques. − The upconversion luminescence efficiency and purity of emission color are vitally important for practical application. Until now, numerous efforts have been conducted to improve luminescence performances, such as inert shell coating, , laser sensitization, , dopant distribution optimization, and host matric selecting .…”

Section: Introductionmentioning

confidence: 99%

Low Power High Purity Red Upconversion Emission and Multiple Temperature Sensing Behaviors in Yb³⁺,Er³⁺ Codoped Gd₂O₃ Porous Nanorods

Zheng

Sun

et al. 2020

ACS Sustainable Chem. Eng.

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Lanthanide ion doped upconversion nanomaterials have attracted great interest because of their extensive application, especially in color display and temperature sensing. However, control synthesis of lanthanide ion doped upconversion nanomaterials with high color purity and excellent temperature sensing properties remain a great challenge. Herein, the first preparation of Yb 3+ ,Er 3+ codoped Gd 2 O 3 porous nanorods not only achieve high purity red upconversion under low pump power but also possess superior temperature sensing performance. By utilizing a single NIR 980 nm laser, the high purity red and orange emission with high color purity of 99.7%, 99.6% are simultaneously realized under low power of 10 mW, respectively. Furthermore, excellent temperature sensing performing, integrating ultrahigh absolute sensitivity (S a ), outstanding relative sensitivity (S r ), and good signal discriminability (ΔE ≈ 1059 cm −1 ) is implemented in single Gd 2 O 3 :Yb 3+ ,Er 3+ nanorods based on the fluorescence intensity ratio (FIR) technique from stark sublevels of Er 3+ ions. Particularly, the maximum S a and S r of the thermally coupled level (TCL) pair by (G 1+ G 2 )/G 4 is 1.86% (at 558 K) and 1.51% (at 298 K), which is superior to the sensitivity based on traditional TCL pair by stark levels of 2 H 11/2 / 4 S 3/2 . Additionally, experimental results demonstrate that the values of S a and S r from the stark sublevels are proportional to energy spacing (ΔE), overcoming the dilemma between relative sensitivity and absolute sensitivity based on traditional TCL pairs. This work opens a new avenue toward constructing high purity emission and multiple temperature sensing performing materials.

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Constructing a “Native” Oxyfluoride Layer on Fluoride Particles for Enhanced Upconversion Luminescence

Cited by 42 publications

References 43 publications

Constructing lattice‐mismatched upconversion luminescence heterojunctions via light welding in seconds

Constructing lattice‐mismatched upconversion luminescence heterojunctions via light welding in seconds

Enhanced Power Conversion Efficiency Using a Ce³⁺:SrF₂ Down-Shifting Nanophosphor-Based Photoelectrode for Dye-Sensitized Solar Cell Applications

Low Power High Purity Red Upconversion Emission and Multiple Temperature Sensing Behaviors in Yb³⁺,Er³⁺ Codoped Gd₂O₃ Porous Nanorods

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Constructing a “Native” Oxyfluoride Layer on Fluoride Particles for Enhanced Upconversion Luminescence

Cited by 42 publications

References 43 publications

Constructing lattice‐mismatched upconversion luminescence heterojunctions via light welding in seconds

Constructing lattice‐mismatched upconversion luminescence heterojunctions via light welding in seconds

Enhanced Power Conversion Efficiency Using a Ce3+:SrF2 Down-Shifting Nanophosphor-Based Photoelectrode for Dye-Sensitized Solar Cell Applications

Low Power High Purity Red Upconversion Emission and Multiple Temperature Sensing Behaviors in Yb3+,Er3+ Codoped Gd2O3 Porous Nanorods

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Product

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Enhanced Power Conversion Efficiency Using a Ce³⁺:SrF₂ Down-Shifting Nanophosphor-Based Photoelectrode for Dye-Sensitized Solar Cell Applications

Low Power High Purity Red Upconversion Emission and Multiple Temperature Sensing Behaviors in Yb³⁺,Er³⁺ Codoped Gd₂O₃ Porous Nanorods